The 'N' word should be BANNED from all dictionaries, as it is more offensive than even the worst of swear words, which aren't included, are they?
Dictionaries include words because people use them. When you read or hear the word "nigger" for the first time, you want to know what it means and why it is offensive. If you didn't allow it in dictionaries, how would you find out?
It's as absurd as demanding that medical textbooks omit pictures of human genitalia because they are naughty.